primitive cell for intake or exlusion of material. It allowed the appearance of membrane bound protocell and that has eventually given first cell on earth. The mutation in DNA and selection of fast growing cell give rise to the appearance of first primordial cell. The first cellular form on earth appeared ~2000 million years ago.

UV RADIATION OR ELECTRIC DISCHARGE IS SYNTHESIZING NEW ORGANIC MOLECULES BUT THESE PRESENCE OF OXYEGN IS EITHER DISTROYING THESE MOLECULES AND NOT ALLOWING CONDENSATION REACTIONS. HENCE, ORGANIC EVOLUTION IS NOT POSSIBLE IN THE CURRENT EARTH ATMOSPHERE.